Update release frontend tests to use JSON fixture

Nathan Friendrequested to merge
nfriend-use-release-frontend-fixture into master

What does this MR do?

Updates all release frontend tests to use the JSON frontend fixture (added in !43218 (merged)) instead of hard-coded data in mock_data.js.

The unused data in mock_data.js is removed as part of this MR.

This MR also makes a few small modifications to the frontend fixture to include extra data that some of the frontend tests need.

What doesn't this MR do?

This MR does not update any tests to use the new GraphQL frontend fixture (added in !43231 (merged)). This will be done in a separate MR.

Edited by Nathan Friend

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